I have a with a 2002 7.3 powerstroke owned sense it was new. It started using alot of at 42000 it uses 1 quart to 100 miles almost exactly. It has been several ford dealers all the injectors o rings were replaced and number 8 injector recently been replaced. The turbo has been checked on the intake no oil leaks. The turbo was checked for end play as well. Were really at a loss the blow-by was also checked and it checks out all ok. Any Ideas or any help would be greatly appreciated.